Monti-Nuti model

The backbone of the Monti-Nuti model is that of the Menegotto-Pinto relationship ... 

In order to tackle difficulties such as those discussed in the previous section, Dodd and Restrepo-Posada (1995) introduced the idea of major, minor and simple reversals, whilst Balan et al. (1998) distinguished reversals into complete and incomplete, with a value of 2fy being adopted as a threshold parameter. For the Monti-Nuti model, Attolico et al. (2000) proposed that whenever small strain variations take place, the model should follow the backbone curve before the last strain reversal. 

The applicability of a material model depends largely on the values that the user/engineer will choose for the parameters of the model. In most cases in order to select appropriate values, calibration of the model and hence experimental results are required. Usually this sort of information is not available and therefore default values have to be used. When the law employed is sensitive to its parameters, lack of experimental results may narrow considerably its applicability. For both the Monti-Nuti and the Menegotto-Pinto models, suggested values can be obtained from various publications. A typical range for the model parameters are listed in Table 1. Bold letters denote the values that have been found appropriate for a wide range of applications by the authors. 

The interest of this study is on uniaxial stress-strain relationships, which can be used in the framework of a fiber beam-column element and also can capture accurately the response of a linear element with minor bending stiffness such as a reinforcing bar. In particular, special attention is paid on the model proposed by Monti and Nuti (1992). 

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